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Reports decimal number literals that use the underscore numeric separator with groups where the number of digits is not three.
Such literals may contain a typo.
<p>This inspection will not warn on literals containing two consecutive underscores.
It is also allowed to omit underscores in the fractional part of <code>double</code> and <code>float</code> literals.
<p><b>Example:</b> <code>int oneMillion = 1_000_0000;</code></p>
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